The standard specifies a number of requirements relating to the mechanical resistance of the panel, including the determination and specification of the Shear Strength and Shear Modulus of the core of the panel. This is determined using a four-point bend test where the ultimate load carried by the specimen failing in shear must be measured and where the shear modulus is calculated from the load deflection curve.

It is important that the flexural fixture is designed to minimize play or backlash, and that the loading plates that contact the sample are of sufficient width to prevent damage to the surface of the core. Maximum test loads depend on the core thickness and material, but are typically below 50 kN. For this test, we suggest using a 5900 Series Universal Testing Machine combined with Bluehill® Software, which can automatically calculate the values of Shear Strength and Shear Modulus.

5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.

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